Please use this identifier to cite or link to this item: http://hdl.handle.net/10419/50608
Authors: 
Balcombe, Kelvin
Fraser, Iain
Year of Publication: 
2009
Series/Report no.: 
School of Economics discussion papers 09,16
Abstract: 
A new approach is developed for the treatment of 'Don't Know' (DK) responses, within Choice Experiments. A DK option is motivated by the need to allow respondents the opportunity to express uncertainty. Our model explains a DK using an entropy measure of the similarity between options given to respondents within the Choice Experiment. We illustrate our model by applying it to a Choice Experiment examining consumer preferences for nutrient contents in food. We find that similarity between options in a given choice set does explain the tendency for respondents to report DK.
Subjects: 
choice experiment
respondent uncertainty
Bayesian methods
JEL: 
C35
I18
Q18
Document Type: 
Working Paper

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